Calcium metal is burned completely in oxygen to form 11.2g of calcium oxide. Find the volume of the required oxygen. (Ca = 40, O = 16, 32 of oxygen has 24.4L) *​

it is stable as it is in group 0 which have full outer shells of electrons

d

explanation:

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.